NC0069841_Other_20221114

Strickland, Bev
From: Jonathan Jordan <[e-mail]>
Sent: Monday, November 14, 2022 8:04 AM
To: Scheller, Roberto
Cc: Andy Neff; Rick Mareth
Subject: [External] Crooked Creek Flows
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Roberto,
As per our phone conversation on Thursday 11/10/2022 at 10:OOAM, we found a discrepancy in the effluent flow
reading at our Crooked Creek Facility (permit #NC0069841). On 10/31/2022 our in house Instrumentation and Controls
department went out to investigate the difference in Influent and Effluent flow readings. The effluent flow meter at this
facility is a rectangular weir with ultrasonic level indication. Upon investigation it was found that the ultrasonic level
reading was off by approximately 1/2 inch. On the morning of 11/1/2022 we had our calibration contractor CITI on site to
confirm and correct the finding and provide a recalibration of the meter. At this time it is still unclear as to the degree of
inaccuracy, this uncertainty is largely due to the accuracy curve during varying flows. In an effort to confirm the
calibrated results, we have installed a transit time non -contact meter on the force main of the effluent pump station and
plan to replace the transit time meter with a mag meter. Once the mag meter is installed and functional we may request
a permit modification to use the mag meter as our permitted flow monitoring location. If you have any questions or
concerns please feel free to reach out to Rick Mareth at 704-617-6537 or [e-mail] or myself at
any time.
Thanks,
Jonathan Jordan
WRF Superintendent I Water & Wastewater
T 704.296.4227
M 704.562.4542
[e-mail]
www.unioncountync.gov
UNION
COUNTY
WAT E R
Union County Government
4600 Goldmine Rd
Monroe, NC 28110
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